After wearing them in one place, we take the custom fitted masks off before getting in the car and put them in a bag before sanitizing hands. We carry several clean masks and put one before going into the next place.
Some people have been paranoid or even hostile about other people wearing masks and minding their own business, so I’m going to put check valves in them and routinely insert the better filters in the pockets. ;D
Where do you find the valves?
Sort of reminds me of this (one of my favorite SNL skits).
https://www.nbc.com/saturday-night-live/video/anal-retentive-chef/n9695